3d vertex.index equivalent in UV 2d
thanks to @Chebhou here the answer:

for v in ob.data.vertices : 
            for p in ob.data.loops :

                if v.index == p.vertex_index  and v.select:

                    x = ob.data.uv_layers.active.data[p.index].uv[0]
                    y = ob.data.uv_layers.active.data[p.index].uv[1]

                    print(v.index, " 3d co: ", v.co, " UV co: ", x,",",y)